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Birdflight as the Basis of Aviation: A Contribution Towards a System of Aviation by Otto Lilienthal (Paperback, 2000)

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After a comprehensive scientific study of how birds fly, Lilienthal recognized the superiority of curved wing surfaces, and then developed a theory of flight. From 1891 to 1896 he designed, built, and flew a series of hanggliders, becoming the first man to fly.